In the frozen Land of Ice, every penguin’s life is governed by strict norms of perfection and tradition. But young penguin girl Thelma refuses to conform. She is not ready for the "Great Leap," a ritual that marks the transformation into a "perfect penguin." As her fifth birthday approaches, Thelma receives a heartfelt letter from her friends in the Green Land, setting her on an unforgettable adventure toward self-discovery. By her side are her loyal companions – Wilhelm, the flying cat, and Sofia, the mouse. There will be a celebration, and a giant snail cruise ship will take them back to where the ice awaits – home!